2019-6-15 · Otumba is a municipio (municipality) of State of Mexico in Mexico.The municipal seat (cabecera municipal) and largest settlement is Otumba de Gómez Farías.The municipality of Otumba has a land area of some 143.42 square kilometres (55 sq mi), and a population recorded in the intermedial 2005 census, the Conteo de Población y Vivienda, of 29,873.